Nonlinear finite element analysis of tunnels

Yıldırım, Musa


Analytical solution for single phase microtube heat transfer including axial conduction and viscous dissipation
Barışık, Murat; Güvenç Yazıcıoğlu, Almıla; Department of Mechanical Engineering (2008)
Heat transfer of two-dimensional, hydrodynamically developed, thermally developing, single phase, laminar flow inside a microtube is studied analytically with constant wall temperature thermal boundary condition. The flow is assumed to be incompressible and thermo-physical properties of the fluid are assumed to be constant. Viscous dissipation and the axial conduction are included in the analysis. Rarefaction effect is imposed to the problem via velocity slip and temperature jump boundary conditions for the...
Flow characterization study and fire experiments in a reduced scaled tunnel
Abuaisheh, Majd Basil Abdel Muhsen; Yozgatlıgil, Ahmet; Pınarcıoğlu, Mehmet Melih; Department of Mechanical Engineering (2019)
This work is an experimental study on the subject of tunnel fires, which is conducted on a ventilated 1/13 scaled tunnel model in the Fluid Mechanics Laboratory, Department of Mechanical Engineering of Middle East Technical University. In order to perform the experiments, in the first stage, the tunnel model was completely renovated, and its overall condition was improved to obtain better means of control and accuracy on the experimental measurements. In the second stage of the thesis, a flow characterizati...
Shape optimization of wheeled excavator lower chassis
Özbayramoğlu, Erkal; Söylemez, Eres; Department of Mechanical Engineering (2008)
The aim of this study is to perform the shape optimization of the lower chassis of the wheeled excavator. A computer program is designed to generate parametric Finite Element Analysis (FEA) of the structure by using the commercial program, MSC. Marc-Mentat. The model parameters are generated in the Microsoft Excel platform and the analysis data is collected by the Python based computer codes. The previously developed software Smart Designer [5], which performs the shape optimization of an excavator boom by ...
Quasi-incompressible and quasi-inextensible element and material formulation for an isotropic medium
Rodoplu, Burak; Dal, Hüsnü; Department of Mechanical Engineering (2018)
The contribution presents a novel finite element formulation for quasi-inextensible and quasi-incompressible finite hyperelastic behavior of transversely anisotropic materialsandaddressesitscomputationalaspects. Theformulationispresentedinpurely Eulerian setting and based on the additive decomposition of the free energy function into isotropic and anisotropic parts where the isotropic part is further decomposed intoisochoricandvolumetricparts. Forthequasi-incompressibleresponse,theQ1P0 element formulation is ...
Assessment of twin tunnel induced ground deformation by empirical and numerical analyses (Eurasia tunnel: NATM part, Istanbul, Turkey)
Ağbay, Ebru; Topal, Tamer; Department of Geological Engineering (2019)
Pre-support systems become very important for inner-city shallow tunnels especially while applying New Austrian Tunneling Method (NATM) which requires some deformation to relieve the stress. Previous studies about assessing the magnitude of surface displacements caused by twin tunneling do not include the effects of presupport system and stress release by deformation. Moreover, most of the established empirical equations were obtained by using data from tunnel passing through clayey soil. Objective of this ...
Citation Formats
M. Yıldırım, “Nonlinear finite element analysis of tunnels,” Ph.D. - Doctoral Program, Middle East Technical University, 1994.